(19)

(11)

EP 1 700 426 A2

(12)

(88) Date of publication A3: 23.02.2006 (43) Date of publication: 13.09.2006 Bulletin 2006/37 (21) Application number: 04801486.4 (22) Date of filing: 07.12.2004

(51) International Patent Classification (IPC):  H04L 12/28(2006.01) (86) International application number: PCT/IB2004/052693 (87) International publication number: WO 2005/064812 (14.07.2005 Gazette 2005/28)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR Designated Extension States: AL BA HR LV MK YU (30) Priority: 22.12.2003 EP 03104915 (71) Applicant: Koninklijke Philips Electronics N.V. 5621 BA Eindhoven (NL)	(72) Inventor: BAKER, Keith NL-5656 AA Eindhoven (NL) (74) Representative: Groenendaal, Antonius W. M.  Philips Intellectual Property & Standards P.O. Box 220 5600 AE Eindhoven 5600 AE Eindhoven (NL)